#include <string.h>
#include <stdio.h>

unsigned char hdigit(unsigned char c);

int checkArray(char* hx, int length){
    int i;
    for (i = 0; hx[i] != '\0'; i++);
    if (i > length){
        return -1;
    }
    return 0;
}

int getSign(unsigned char* c)
{
    const char govno[5] = "7FFF\0";
    if (strcmp(c, govno) > 0)
    {
       return 1;
    }
    else
    {
       return 0;
    }
}

signed getKakoytoNumber(char* hx)
{
    int s = 0, p = 0;
    char * cpi = hx;
    while( *++cpi );
    while( hx != cpi-- )
    {
        s += hdigit(*cpi) << p;
        p += 4;
    }

    return s - 65535;
}
//----edited-------------------------------
int power(int num, int count){
    int oldNum=num;
    for (int i=0; i<count; i++){
    num*=oldnum;
    }
    if (count==0){
         num=1;
    }
    return num;
}

double getSignedNumber(char* hx){
int i=0;
    if(hx[i]=='1'){
    for (i=1; i<strlen(hx); i++){

        switch(hx[i]){

        case '1':
        hx[i]='0';
        break;
        case '0':
        hx[i]='1';
        break;
        }
    }
    }
    return hx;
}

int getNumFrom2(char* hx){
    int i, j, num;
    i=0;
    j=0;
    if (hx[i]=='1'){
    for (int i=strlen(hx); i>1; i--){
        switch(hx[i]){
        case '1':
        num+=power(2, j)*1;
        break;
        case '0':
        num+=power(2, j)*0;
        break;
        }
        j++;
    }
    num*=(-1);
    } else{
    for (int i=strlen(hx); i>1; i--){
        switch(hx[i]){
        case '1':
        num+=power(2, j)*1;
        break;
        case '0':
        num+=power(2, j)*0;
        break;
        }
        j++;
    }
    }
    return num;
}
//------------------------------------------
unsigned char hdigit(unsigned char c)
{
    return (c >= 'A' ?  c - 'A' + 10 : c - '0');
}

unsigned getKakoytoUnsignedNumber(char* hx)
{
    unsigned s = 0, p = 0;
    char * cpi = hx;
    while( *++cpi );
    while( hx != cpi-- )
    {
        s += hdigit(*cpi) << p;
        p += 4;
    }

    return (unsigned)s;
}

int HEX_TO_DEC(char* hx)
{
    //if (checkArray (hx, length) == -1){
        //printf("Error! Max. %d chars!", length);
        //printf("\n");
        //exit(1);
    //}
    return getKakoytoNumber(hx);

}